Zero-drift precision op amp for high-speed signal chains
STMicroelectronics introduces the TSZ901 operational amplifier for accurate, temperature-stable analog signal conditioning.
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STMicroelectronics has released the TSZ901 operational amplifier, combining zero-drift precision with a 10 MHz gain-bandwidth to address high-speed, high-accuracy analog signal conditioning in automotive, industrial, and instrumentation applications.
Addressing accuracy over temperature and speed
Analog front ends in modern electronic systems increasingly operate across wide temperature ranges while handling fast-changing signals. In such environments, offset drift, noise, and stability limitations can directly affect measurement accuracy and long-term reliability.
The TSZ901 is designed to maintain stable precision characteristics across the full operating-temperature range from −40 °C to +125 °C, reducing the need for temperature-dependent calibration or trimming.
Zero-drift architecture with extended bandwidth
The TSZ901 uses chopper-stabilization to minimize offset and drift, a technique more commonly associated with lower-bandwidth amplifiers. In this design, STMicroelectronics applies the approach to a 10 MHz gain-bandwidth op amp, enabling higher-speed operation without sacrificing DC accuracy.
The input-offset voltage is specified at 5 µV at 25 °C and remains within 8 µV across the full temperature range. This contrasts with conventional precision op amps that achieve low offset only within a limited temperature window or require external trimming to maintain accuracy.
Noise, power, and supply flexibility
With an input-referred noise density of 9 nV/√Hz, the TSZ901 supports low-noise signal acquisition in precision measurement circuits. Power consumption is limited to 1.5 mA at a 5 V supply, balancing speed and efficiency.
The device operates from supply voltages ranging from 2.5 V to 5.5 V, allowing integration into both low-voltage and standard industrial or automotive power domains.
Application relevance and system impact
The combination of low offset, low noise, and wide bandwidth makes the TSZ901 suitable for signal paths where both dynamic performance and static accuracy are critical. Typical applications include MEMS sensor interfaces, current-sense amplifiers, transimpedance amplifiers, instrumentation buffers, active filters, voltage references, and precision analog front ends.
By maintaining accuracy across temperature without extensive calibration, the amplifier can reduce external compensation components, simplify circuit design, and lower the overall bill of materials. These characteristics can also shorten production test time and reduce recalibration requirements over the system lifetime.
By extending zero-drift precision into the 10 MHz class, the TSZ901 addresses a gap between traditional low-speed precision amplifiers and higher-speed devices that compromise on accuracy, supporting more stable and compact analog designs in demanding environments.
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